Coupling for drill or pump rods



UNITED STATES PATENT OFFICE.

JOHN R. CROSS, OF CHICAGO, ILLINOIS.

COUPLING F-OR DRILL OR PUMP RODS.

Specification forming part of Letters Patent No. 49,386, dated August 151365.

To all who-m it may concern.

Beit known that I, JOHN R. CRoss, of the city of Chicago, county of Cook, and State ot' Illinois, haveinvented new and useful Improvements in Couplings for Drill or Pump Rods; and I do hereby declare that the following is a full and exact description thereof, reference being had to theaccompanyingdrawings,making a part of this specication, in which- Figure I represents avertical section of my improved device; Fig. II, a cross-section of same, Fig. III, a vertical section of a modification of the same; Fig. IV, a vertical section of a second modication; Fig. V, crosssection of same; Fig. VI, vertical section of third modification 5 Fig. VII, cross-section of same.

In long drill -rods formed of short lengths coupled together, and used for pumping and drilling oilwells or other similar purposes, greatdifticulty has heretofore been found in so coupling such lengths togethertha't, while admitting of easy and quick disconnection, the sudden vibrations and twistin g strains to which they are subjected will not cause them to work loose and eventually become disconnected.

My invention overcomes this difticulty and forms a coupling by which the lengths ot' rods may be quickly and firmly connected, and in a manner which makes it impossible for them to become disconnected by any force or strain to which they may be subjected, while it allows them to be quickly and easily nncoupled when desired.

A A, Fig. I, represent two lengths ot' rod to be coupled or united, the contiguous ends being halved or lapped past cach other, as shown at a2. Screw-threads are cut upon the contiguous endsin such niannerthat the thread follows continuously from one to the other.

B represents a screwT sleeve or nut made to lit the thread on the rod, which, on one of the rods at least, should be equal in extent to the length of the sleeve, to allow the sleeve to be screwed thereon sufficiently far to cause its end to project through the sleeve. When in this position the other rod may be brought in line,

and so that its thread shall form a continuation of that of the iirst rod, and the sleeve being then turned in the reverse direction until it laps equally onto the end of each rod, the two rods are securely and firmly coupled to gether. The lapping of the end of one rod past the end of the other prevents the possibility ot any twisting strain applied to either rod un# screwing the rods from the sleeve, since the twist of one rod is directly communicated to the other. The rods can only be uncoupled by the turning ot' the sleeve or'nut, an event not likely to occur under any circumstances in which the coupling may be employed. Any

possibility'of this is, however, prevented by the use of a jamnut or sleeve, C, of less outside diameter than the sleeve B; or the thread on the rods, after the sleeve is screwed into position, may be filled by winding twine or wire therein in a manner to prevent any movement` of the sleeve.

In Fig. III the contiguous ends ofthe rods,

instead ot' being halved and lapped past each other, are simply beveled `or chamt'ered on", as represented. This, however, is simply a modification ofthe first device, embodying the Sallie principle-i. e., preventing one rod from turning in the sleeve independently of the other.

In Fig. IV dowel-pins d are used for the samepurpose, andin Fig. VI a square shank and mortise, c.

Having thus described my invention, what I claim, and desire to secure by Letters Patent,

Lapping the contiguous ends of tworods to be coupled together past each other, and cutting a. screw-thread thereon which shall run con tinuously from one to the other, in combination with a sleeve or nut, working in the manner and for the purposes set forth.

JOHN R. CROSS.

Witnesses:

B. H. MUEHLE, W. H. FoRBUsH. 

